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Ultrashort, intense ultraviolet pulse generation by efficient frequency tripling and adapted phase matching
Optics Letters
|December 12, 2007
Summary
Researchers achieved efficient frequency tripling of chirped pulses using KDP crystals. This method produces powerful ultraviolet pulses and is scalable for high-energy lasers.
Area of Science:
- Nonlinear Optics
- Laser Physics
- Materials Science
Background:
- Frequency tripling is crucial for generating shorter wavelengths from lasers.
- Broadband chirped pulses offer advantages in energy delivery.
- Potassium Dihydrogen Phosphate (KDP) crystals are widely used for nonlinear frequency conversion.
Purpose of the Study:
- To demonstrate efficient frequency tripling of chirped laser pulses.
- To achieve broadband ultraviolet pulses at 352 nm.
- To assess the scalability of the technique for high-power laser systems.
Main Methods:
- Utilizing adapted chirping techniques for input pulses.
- Employing thick Potassium Dihydrogen Phosphate (KDP) crystals for frequency tripling.
- Compressing the generated 352 nm pulses using a UV grating-pair compressor.
Main Results:
- Achieved efficient frequency tripling of 1057 nm chirped pulses.
- Generated millijoule-level broadband pulses at 352 nm.
- Compressed the 352 nm pulses to a duration of 220 femtoseconds (fs).
Conclusions:
- The developed technique enables efficient frequency tripling of chirped pulses.
- The method is suitable for generating high-energy, short-duration UV pulses.
- The technique demonstrates scalability for kilojoule-petawatt laser systems.
